Brick-grinding machine



(No Model.)

W. F. STEDMAN' BRICK GRINDING MACHINE.

Patented Feb. 23, 1892.

UNITED STATES PATENT UFFIcE- IVILIJIAM F. STEDMAN, OF BOSTON, MASSACHUSETTS.

BRICK-GRINDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 469,643, dated February 23, 1892.

Application filed June 25, 1891. Serial No. 397,554- (No model.)

To all whom it may concern.-

Be it known that'I, WILLIAM F. STEDMAN, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Brick-Grinding Machines, of which the following is a specification.

My invention relates to apparatus for grinding the surface of bricks, tiles,or stones; and it consists, generally speaking, in an attachment to the stationary beam which ordinarily exists above the rubbing-bed, consisting of a brick holder or frame adjustable in one or more ways, within which the brick can be mounted and held in a given position while it is being ground,thus rendering it possible to grind any number of bricks to exactly the same angle.

In Figure 1 of the drawings is shown in front elevation myim proved attachment, constructed in the best form now known to me, mounted upon the beam, Fig. 2 beinga crosssection on line no a: of Fig. 1 with brick in place. Fig.3 is a plan,the upper ends of the uprights and adj ustable brace being broken off. Fig. 4 is an end elevation. Fig. 5 is a view in perspective showing the location of the Various parts above the rubbing-bed, and Fig. 6 is a perspective of the brick-holding frame.

In the drawings, P is a rotary rubbing-bed of ordinary construction, such as is used for grinding bricks, marble, &c., Q being its axis of rotation.

My brick-holding frame is lettered H J in the drawings. As shown,it consists of athreesided rectangular frame H, to which a fourth side J is secured by set-screws, the whole being adapted to hold four bricks, and for this purpose being provided with set-screws M. At each end of this frame ways are provided, which slide upon uprights B, pivoted to brackets O, projecting from the beam N. For strength and convenience I prefer to provide blocks D,in which the ways are made, as shown. The upper end of each upright B is kept in place by the brace A, one end of which is attached thereto, the other end being attached to the beam N. I prefer to provide the upper end of each brace with a slot and set-screw G, by which it is attached to the upright B, the lower end being pivotally connected to the brace, as shown. By this means the uprights B, and consequently the frame H J, can beset at any desired angle to the rubbing-bed P. Within the frame there are provided two bars I, one or both of which may be slotted, so that its position in the frame may be adjusted at either or both ends, being held in place by screws L. Together they form gages by means of which the position of the bricks in the framev may be adjusted as desired, the size of the frame being altered to correspond with the size of the bricks by the set-screws K, which determine the position of the side J, and the bricks being held in place by set-screws M,

which clamp the brick against the opposite side of the frame. (See Fig. 3, Where four bricks R are shown in position.) The angle of the brick to the bottom of the frame is therefore adjustable, as well as the angle of the frame to the rubbing-bed. To govern the amount of surface to be removed, and so make the frame automatic, adjustable stops should be provided to prevent the frame from dropping too near the rubbing-bed.

As a convenient form of stop I provide the rod E, slotted and bolted to the sliding block D by the bolt F. The top of each rod E is bent over so as to strike the top of the upright B and form with its upper surface a stop by which any further descent of the frame may be prevented.

In using my brick-holder the gage-bars I are first adjusted to the desired angle, one bar, for example,being raised higher than the other. Moreover, they may be kept parallel with the bottom of the frame or not, as circumstances require. Next theframe is set at the desired angle to the rubbing-bed by means of the braceA and its adjusting-screw. Then, in order to govern the amount of brick to be ground off, the position of the stops is adj usted by altering the length of rods E. Bricks are now put into the frame from below, the size of the frame being first approximately adj usted by set-screws K. For this purpose the frame is slid up off the uprights. Each brick being fastened in place by its screw M, the frame is placed on the upright again and allowed to drop, so that the bricks rest on the rubbing-bed, and there they are ground, being held down by gravity until the hooked end of the stop E rests upon the top of the upright B, when no further grinding can be done.

The advantages of an adjustable frame embodying the above features will be apparent to all skilled in the art. While being extremely simple in construction by its various adjustments, the details of which may be varied and which need not be interfered with by the removal and introduction of the bricks,

it can be used to grind any number of bricks to exactly the same size and shapea result which, so far as I know, has been heretofore impossible. Moreover, a number of these frames can be used with the same rubbingbed and tended by the same workman.

What I claim as my invention is- 1. In a brick-grinding machine,in combination, the brick-holder above described, provided with the rods E, shaped as shown and adj ustably attached thereto, said brick-holder being mounted in vertical ways B and adapted to slide freely thereon and said rods E being located in proximity to the ways B and forming astop therewith,as and for the purposes set forth.

2. In a brick-grinding machine, the brickholder above described, provided with gages consisting of two narrow bars or plates I I,

each adjustably attached to one side of the frame, one of the narrow edges of each bar being located to rest against the top of the brick, as and for the purposes set forth.

3. In a brick-grinding machine, a brickholder pivotally hung between horizontal arms on a horizontal axis and provided with means whereby its position on its horizontal axis may be fixed, as set forth.

4. In a brickgrinding machine, a brickholder adapted to slideon vertical ways, the lower ends of said ways being pivotally mounted upon brackets, in combination with braces A, the lower ends of said braces being pivotally connected to the beam Nand their upper ends being adj ustably attached to the upper ends of said ways, as set forth.

5. In a brick-grinding machine, a brickholde'r hung on its longitudinal axis and capable of a sliding vertical movement, provided with means, substantially as described, whereby the extent of its downward vertical movement may be adjusted, as set forth.

In testimony whereof I have hereunto subscribed my name this 23d day of June, A. D.

WILLIAM F. STEDMAN. Witnesses:

WILLIAM H. J UNGE, GEORGE O. G. COALE. 

